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d101a72d79
Is this really a winning transformation?
fold (shl (srl x, c1), c2) -> (shl (and x, (shl -1, c1)), (sub c2, c1)) or
(srl (and x, (shl -1, c1)), (sub c1, c2))
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76535 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
827 B
LLVM
30 lines
827 B
LLVM
; RUN: llvm-as < %s | llc -march=x86
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@bsBuff = internal global i32 0 ; <i32*> [#uses=1]
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@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 ()* @bsGetUInt32 to i8*)], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
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define fastcc i32 @bsGetUInt32() nounwind ssp {
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entry:
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%bsBuff.promoted44 = load i32* @bsBuff ; <i32> [#uses=1]
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%0 = add i32 0, -8 ; <i32> [#uses=1]
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%1 = lshr i32 %bsBuff.promoted44, %0 ; <i32> [#uses=1]
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%2 = shl i32 %1, 8 ; <i32> [#uses=1]
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br label %bb3.i17
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bb3.i9: ; preds = %bb3.i17
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br i1 false, label %bb2.i16, label %bb1.i15
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bb1.i15: ; preds = %bb3.i9
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unreachable
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bb2.i16: ; preds = %bb3.i9
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br label %bb3.i17
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bb3.i17: ; preds = %bb2.i16, %entry
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br i1 false, label %bb3.i9, label %bsR.exit18
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bsR.exit18: ; preds = %bb3.i17
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%3 = or i32 0, %2 ; <i32> [#uses=0]
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ret i32 0
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}
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